Police are trying to trace a woman who helped to detain a man who had allegedly assaulted a female police officer while she was trying to arrest him in Hertford on Christmas Eve.

The actions of the unidentified woman have been praised by East Herts Chief Inspector Gerry McDonald, who is now keen to thank her personally.

CCTV footage of the man’s arrest near the Salisbury Arms on Fore Street shows the “quick-thinking” woman put her foot out to trip the suspect, after he had pushed a police constable while attempting to flee.